transition to all versions numbers in labels (#175)

* update supercronic to the latest release
* update tagging for base
* fix version tag for core
* put versions for all containers into labels instead
* define vcf_ref once
* remove cache-from as caches will be invalidated early on because of passing the git ref early on
* do not rebuild when publishing
* do not rebuild when publishing
* reduce layers required for env assignment
* pull newer base images for kdav, scheduler and ssl if available
* alsp publish tag for ldap containers
* fix publishing of ssl container

utils/Dockerfile

@@ -1,6 +1,15 @@
 ARG docker_repo=zokradonh
 FROM ${docker_repo}/kopano_core
 
+LABEL maintainer=az@zok.xyz \
+    org.label-schema.name="Kopano utils container" \
+    org.label-schema.description="Container that bundles various cli tools from Kopano Groupware Core" \
+    org.label-schema.url="https://kopano.io" \
+    org.label-schema.vcs-ref=$VCS_REF \
+    org.label-schema.vcs-url="https://github.com/zokradonh/kopano-docker" \
+    org.label-schema.version=$KOPANO_CORE_VERSION \
+    org.label-schema.schema-version="1.0"
+
 RUN apt-get update && apt-get install --no-install-recommends -y \
     vim nano man \
     kopano-backup \